im8cl6eeMNgenia
im8cl6eeMNgenia im8cl6eeMNgenia
  • 20-07-2016
  • Mathematics
contestada

which are the solutions of x2 = –7x – 8?

Respuesta :

apologiabiology
apologiabiology apologiabiology
  • 20-07-2016
add 7x+8 to both sides
x^2+7x+8=0
use quadracit formula
x=[tex] \frac{-b+/- \sqrt{b^2-4ac} }{2a} [/tex]
a=1
b=7
c=8


x=[tex] \frac{-7+/- \sqrt{7^2-4(1)(8)} }{2(1)} [/tex]
x=[tex] \frac{-7+/- \sqrt{49-32} }{2} [/tex]
x=[tex] \frac{-7+/- \sqrt{17} }{2} [/tex]
aprox
x=-5.56155 or -1.438
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zoeyret1234 zoeyret1234
  • 15-01-2019

Answer:

the answer is C

Step-by-step explanation:


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